Question

Given the electrochemical reaction Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s), calculate the standard cell potential at 25°C if the standard reduction potentials are E°(Cu2+/Cu) = 0.34 V and E°(Zn2+/Zn) = -0.76 V.

Answer 1

To calculate the standard cell potential  Ecell  for the given electrochemical reaction, we can use the following equation:Ecell = E cathode  - E anode In this reaction, Cu2+ is reduced to Cu, so it is the cathode, and Zn is oxidized to Zn2+, so it is the anode. We are given the standard reduction potentials for both half-reactions:E Cu2+/Cu  = 0.34 V  cathode E Zn2+/Zn  = -0.76 V  anode Now, we can plug these values into the equation:Ecell = 0.34 V -  -0.76 V Ecell = 0.34 V + 0.76 VEcell = 1.10 VSo, the standard cell potential for this electrochemical reaction at 25C is 1.10 V.